I've noticed that your some overwrites to Woocommerce files are missing something to make some Woocommerce plugins work.
I've tested this on a local server to prove my point.
I have a Woocommerce plugin called
Woocommerce Availability Notifications
That should work with all well coded themes. But it does not work with Furnicom.
So i've tested by matter of "trail and error" to see which files are overwritten by Furnicom/woocommerce/etc. that makes the plugin stop working.
When I remove the file content-single-product.php from wp-content/themes/furnicom/woocommerce the plugin works!
I then thought, let's try another plugin that does the same as the above.
Woo Stock status But same issue! Not showing on single-product page.
Please provide support for this issue.